<template>
  <a-tree-select
    allowClear
    labelInValue
    style="width: 100%"
    :disabled="disabled"
    :dropdownStyle="{ maxHeight: '400px', overflow: 'auto' }"
    :placeholder="placeholder"
    :loadData="asyncLoadTreeData"
    :value="treeValue"
    :treeData="treeData"
    :multiple="multiple"
    @change="onChange">
  </a-tree-select>
</template>
<script>

  import { getAction } from '@/api/manage'

  export default {
    name: 'JCategorySelect',
    props: {
      value: {
        type: String,
        required: false
      },
      placeholder: {
        type: String,
        default: '请选择',
        required: false
      },
      disabled: {
        type: Boolean,
        default: false,
        required: false
      },
      condition: {
        type: String,
        default: '',
        required: false
      },
      // 是否支持多选
      multiple: {
        type: Boolean,
        default: false
      },
      loadTriggleChange: {
        type: Boolean,
        default: false,
        required: false
      },
      pid: {
        type: String,
        default: '',
        required: false
      },
      pcode: {
        type: String,
        default: '',
        required: false
      },
      back: {
        type: String,
        default: '',
        required: false
      }
    },
    data () {
      return {
        treeValue: '',
        treeData: [],
        url: '/sys/category/loadTreeData',
        view: '/sys/category/loadDictItem/',
        tableName: '',
        text: '',
        code: ''

      }
    },
    watch: {
      value () {
        this.loadItemByCode()
      },
      pcode() {
        this.loadRoot()
      }
    },
    created() {
      this.validateProp().then(() => {
        this.loadRoot()
        this.loadItemByCode()
      })
    },
    methods: {
      /** 加载一级节点 */
      loadRoot() {
        let param = {
          pid: this.pid,
          pcode: !this.pcode ? '0' : this.pcode,
          condition: this.condition
        }
        getAction(this.url, param).then(res => {
          if (res.success && res.result) {
            for (let i of res.result) {
              i.value = i.key
              if (i.leaf == false) {
                i.isLeaf = false
              } else if (i.leaf == true) {
                i.isLeaf = true
              }
            }
            this.treeData = [...res.result]
          } else {
            console.log('树一级节点查询结果-else', res)
          }
        })
      },

      /** 数据回显 */
      loadItemByCode() {
        if (!this.value || this.value == '0') {
          this.treeValue = []
        } else {
          getAction(this.view, { ids: this.value }).then(res => {
            if (res.success) {
              let values = this.value.split(',')
              this.treeValue = res.result.map((item, index) => ({
                key: values[index],
                value: values[index],
                label: item
              }))
              this.onLoadTriggleChange(res.result[0])
            }
          })
        }
      },
      onLoadTriggleChange(text) {
        // 只有单选才会触发
        if (!this.multiple && this.loadTriggleChange) {
          this.backValue(this.value, text)
        }
      },
      backValue(value, label) {
        let obj = {}
        if (this.back) {
          obj[this.back] = label
        }
        this.$emit('change', value, obj)
      },
      asyncLoadTreeData (treeNode) {
        return new Promise((resolve) => {
          if (treeNode.$vnode.children) {
            resolve()
            return
          }
          let pid = treeNode.$vnode.key
          let param = {
            pid: pid,
            condition: this.condition
          }
          getAction(this.url, param).then(res => {
            if (res.success) {
              for (let i of res.result) {
                i.value = i.key
                if (i.leaf == false) {
                  i.isLeaf = false
                } else if (i.leaf == true) {
                  i.isLeaf = true
                }
              }
              this.addChildren(pid, res.result, this.treeData)
              this.treeData = [...this.treeData]
            }
            resolve()
          })
        })
      },
      addChildren(pid, children, treeArray) {
        if (treeArray && treeArray.length > 0) {
          for (let item of treeArray) {
            if (item.key == pid) {
              if (!children || children.length == 0) {
                item.isLeaf = true
              } else {
                item.children = children
              }
              break
            } else {
              this.addChildren(pid, children, item.children)
            }
          }
        }
      },

      onChange(value) {
        if (!value) {
          this.$emit('change', '')
          this.treeValue = ''
        } else if (Array.isArray(value)) {
          let labels = []
          let values = value.map(item => {
            labels.push(item.label)
            return item.value
          })
          this.backValue(values.join(','), labels.join(','))
          this.treeValue = value
        } else {
          this.backValue(value.value, value.label)
          this.treeValue = value
        }
      },
      getCurrTreeData() {
        return this.treeData
      },
      validateProp() {
        let mycondition = this.condition
        return new Promise((resolve, reject) => {
          if (!mycondition) {
            resolve()
          } else {
            try {
              let test = JSON.parse(mycondition)
              if (typeof test == 'object' && test) {
                resolve()
              } else {
                this.$message.error('组件JTreeSelect-condition传值有误，需要一个json字符串!')
                reject()
              }
            } catch (e) {
              this.$message.error('组件JTreeSelect-condition传值有误，需要一个json字符串!')
              reject()
            }
          }
        })
      }
    },
    // 2.2新增 在组件内定义 指定父组件调用时候的传值属性和事件类型 这个牛逼
    model: {
      prop: 'value',
      event: 'change'
    }
  }
</script>
